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Biology
A Level

What gives an enzyme specificity?

Enzymes are typically globular proteins that catalyse a specific reaction. Being proteins, enzymes have a well-defined overall conformation (shape), or 'tertiary structure', which allows formation of a ca...

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Answered by Tom H. Biology tutor
5126 Views

Describe the differences between the primary and secondary immune responses in terms of B cells and antibody production. Include in your answer a definition of an antibody.

Antibodies are produced by B cells, mostly by plasma cells, in response to signals from other cells of the immune system. They are also known as immunoglobulins and have a Y shaped structure.

When ...

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Answered by Hannah B. Biology tutor
11159 Views

How does genetic engineering work?

It is a simple idea whereby we take new working genes, named wild types, and replace the faulty genes of some ones cells. This means the cells will then take up the new DNA and make a functional version o...

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Answered by Edward S. Biology tutor
5530 Views

Describe the mechanism of mammalian breathing.

The process of breathing is made up of two components:

  • Inhalation
  • Exhalation

Inhalation is the process of filling the lungs with air. As they fill they expand and so th...

RR
Answered by Rebecca R. Biology tutor
15536 Views

The black mamba’s toxin kills prey by preventing their breathing. It does this by inhibiting the enzyme acetylcholinesterase at neuromuscular junctions. Use your knowledge of muscle contraction to explain how this prevents breathing.

By inhibiting the enzyme acetylcholinesterase, the neurotransmitter acetylcholine does not get broken down. This causes acetylcholine to build up in the synapse between the motor neurones and muscles of r...

TC
Answered by Tashi C. Biology tutor
8399 Views

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